Dry-pulverizing apparatus



R. E. H. POMEROY.

DRY PULVERlZlNG APPARATUS. APPLICATION HLEDJUIIE 30. I820.

Patented Aug. 29, 1922.

A ORA/5Y8 R. E. H. POMEROY.

DRY FULVERIZING APPARATUS.

APPLICATION FILED JUNE 30. 1920.

1,42%322, Patented Aug. 29, 19226 2 SHEETS-SHEET 2.

UNITED STATES- PATENT OFFICE.

-RALPH E. H. POMEROY, OF CANTON, OHIO- mw-rutvnmzme Arrana'rus.

Application flled June so, 1920.

To on whom it may concern:

Be it known that I, RALPH E. H. POME- ROY, of Canton, in the county of Stark and State of Ohio, have invented acertainnewand useful Improvement 1n Dry-Pulverizing Apparatus, of which improvement the fol- 1 lowing is a specification.

, This invention relates to apparatus for dry pulverizing of various materials, such as cement, lime, plaster, coal, clinker, ores, minerals, phosphate rock paint, pigment, hard rubber, etc., the ob ect being. to provide an improved means for grinding the material and at the same time conductin a 4 .comes: pulverized.

current of air or gas through the materia to carry 03 the lighter portion as the same be- My improvement is particularly adapted to be used in connection with grinding or pulverizing mills of material is introduced into a movable casing, such as a rotatable shell, along with a mass of loose unattached tumbling-devices, such as balls, pebbles,

blocks, rods, bars, or other grinding devices of iron,

steel, or other material of greater hardness than the material to be ground, and adapted to be tumbled about during the movement of the shellto eiiect the grinding or pulverizing action upon the friable material to be pulverized.

- According to one of the features of my a current of air is conducted, through the mass of material and tumbling devices during the operation, for carrying off the finer particles, the air being-admitted through perforations or openings in the periphery of-the rotatable shell. The air current may then be passed through a separator, where the heavier particles are taken out and returned to the mill,-while the air current laden with the lighter pulverized portion of material is passed through a dust collector where the pulverized material is deposited and the air liberated or returned to the mill.

In this cyc e-of operation, may be employed for inducing improvement,

an exhaust fan the current of air, and in order that the suction may be h the shell, 5..

Specification of Letters Patent.

ratus embodying my improvement;

the type in which the Patented Aug. 29, 1922-.

Serial No. 393,147.

may, however, be produced in various other ways, if preferred.

In the accompanying drawings: Figure 1 is a diagrammatic view, in elevation, showmg the several parts of a pulverizing appavertical longitudinal section of the improved pulveriz ing mill; Fig. 3, a transverse section of the same; and Fig. 1n section, showing the air seal between the fixed casing and the rotatable shell.

According to the preferred design, the improved pulverizing mill comprises a rotatable shell, 5, referably cylindrical and connected to suitable end heads, 6, having hollow extension trunnions, 7, rotatably mounted in fixed bearings, 8, supported upon suitable bases. Any suitable or preferred means may be employed -for'imparting rotary motion to the shell, as for instance, a driving gear, 9, which may be attached to one of the heads, 6, and adapted to engage "with other power drivenggearing, not shown.

Fig. 2, a

4, a detail view,

ber within the shell-is also partly filled with loose grinding devices, 11,- such as balls, pebbles, rods, or bars, of hard material, adapted to be tumbled about with the mate'- rial to be pulverized which is broken up and crushed by the grinding action of these devices during the rotation of the shell.

In order. to carry off the finer portion of the material as it becomes sufficiently ground, a current of air is employed, and in accordance with my improvement, this air is introduced through peripheral openings in the rotating shell, and into and through the mass of material within the shell, and in this instance passes out through the hollow trunnion opposite the feeding-in mechanism. For the purpose of admitting the air, I have shown a stat'onary casing, 12, completely surrounding the rotatable shell and carried by independent supports, 13, an annulaii space or chamber, 14, outside of The interior surface of the shell is protected from wear and a series of metal liners, 15, which are formed with an open air space, 16, communicating through slots, 17, in the shell, with the annular air chamber, 14, and through openings,-

abrasion by v 18, into the interior of the mill. End liners, 19, of metal, are also provided for protecting the end heads, 6.

While the lining for the shell may be constructed in various ways to attain a similar result asto the admission of air through the same, I prefer to form the liners, 15, of

a series of longitudinal sections, each overlapping and interlocking; with adjoining sectlons, as indicated in lining is keyed together and may be retained in place without bolts or other fastening means. The end liners may also be fitted to interlock with the side liners, as shown in Fig. 2, thereby serving as additional keys for locking the same in lace.

P It will be seen that the raised projecting portions of the liner sections, through which the air inlet ports, 18, are formed, constitute longitudinal ribs upon ig. 3, whereby the In a circular arch,

the interior surface of the mill, which construction serves to protect 18, as these are directed at tangential angle into the means, the mass of material or tumbles downward over the inlet ports, a more or less mill. By this the ribbed sur- '-face as the casing revolves, thus constantly falling away from th while the air currents are directed inward through said openings in substantially the same tangential direction so that there is e port openings, 18,

no tendency for the tumbling mass to choke 4 restrict the incoming derstood that this line may be inclined somewhat in the direction of a segmental chord to the casing.

When'the shell is partly filled with the material and the tumbling devices, 11, and rotating in the direction of the arrow indicated in Fig. 3, the mass of material assumes a position in a se ental portion at the lower right hand si e ofthe shell, as shown, an in order to force most of through the mass, and prevent its free pas sage around the annular chamber, 14, and through the liner sections at the other side of the shell, 'de a series of longitudinal radial partitions, 20, attached to the outer casing, 12, and extending into close proximity to the rotatable shell, 5, which artitions effectively obstruct this passage.

y this means, the major portion of the air current is compelled to pass through the mass of balls and material where the g performed. annular air chamber, 14, are closed by overlapping annular flanges, .21 and 22, attached, respectively, to' the fixed casing, 12, and the rotatable shell, 5, as shown more in detail in Fig. 4. The stationary flange, 21,

between the rotating w or inwardly and balls, rolls, d

. turn pipe, 32.

the air in and although there is they form a suficieiitly tight operation of the mill.

he air, after passing through the mill and becoming loaded with the fine material in suspension, is, drawn out through the pipe, 23, of the hollow trunnion by an exhaust fan, 24, which may be driven in any suitable manner, as by a motor, 25, and is then forced through the discharge pipe, 26, into the coarse material separator, 27, which may be of any desired or well known construction. Here the coarser particles of the suspended material, which are not sufficiently fine for the finished product, are separate and returned to the feeding mechanism and the mill, by the return coarse material pipe, 28, for further grinding. The air with the finer pulverized material still in suspension, passes through pipe, 29, into the cyclone dust collector, 30, where the'bulk of the pulverized material is' removed from the air and passes down the fine material pipe into a storage bin, 31. The air which air seal for the material, passes away dust collector, which may be of the usual well known construction, through the return air pipe, '32, and re-enters the annular chamber, 14, around the rotatable shell of the mill. If desired, a $111 ller separator or cyclone collector, 33, having leading to the atmosphere,

nected by a branch pipe, 35, to the air reunder a substantially unic amber, and at the side of the shell next to the material so that the air may have a direct path through the perforations into e mass of material. I The tan operates'to create a continuous from the chamber, 14, through the openshell, cavities, 16, in the ers, and openings, 18, into the mass of tumbl' devices and material which is being ground, where it takes up a cloud of the finely divided material, and carries the same in suspension out through the fan to the separating and collecting devices, where the pulverize portion is deposited, and the hamber, 14, as before described. It will be noted that the create a strong suction from the chamber, 14, through the rotating shell, an out at the hollow trunnion, whereby all 0 ese parts of the mill are operated under of the atmosphere. This has the a slight clearance,

he length of the.

pressure slightly through said openings,

material an outlet separate feeding inlet and air inlet openings in ing atmosphere-,-' and rod'uces an entirely dnstless o erationof t e mill.

While t ere is shown and described in this application a construction in which an ex-' haust fan draws air loaded with the fine material in suspension from the pulverizing mill anddischarges the same under pressure intoa coarse material separator or grader in which the coarser particles are separated and returned to the mill for further grinding, while the current of air with the finer material in suspension passes on to a collector, it will be understood that this comprises no part of my present invention, and no claim therefore is made in this application.

Having now described my invention, I claim as new and desire to secure by ters Patent is: I I

1. A pulverizing apparatus, comprising a rotatable casing having air inlet openings in its periphery, and a feeding inlet for the for the-air and pulveriz material, mechanism for ing, and means for producing a current .0 air inward through said openings and outward through said outlet for carrying oif the pulverized material. 1

2. A pulverizing apparatus, comprising a rotatable casing having air inlet openings in its peripheral wall, a separate outlet for the air and pulverized what Letmaterial, mechanism for rotating said casing, and means for producing a current of air inward 'throu h said openings, and outward-throu h sai sepa-' rate outlet for carrying ofi t e pulverized material. I

3. A pulyerizing apparatus, comprising a rotatable casing, having ,air inlet openings in its peripheral wall, and having a for the material, an outlet for the airand pulverized material, mechanism for rotating said casing, and means for inducing a current of air inwar through said openm s and for maintaining a partialvacuum within said casing.

4. A pulverizin apparatus, comprising a rotatable casing Iiaving hollow trunnions, its peripheral wall, means for feeding the material through one trunnion, mechanism for rotating said casing, and meansfor producing a current of air inward through said peripheral openings and outward through the other hollow trunmon. r

5. A pulverizing apparatus, comprising a cylindrical casing rotatably mounted on a horizontal axis and having air inlet openings in its cylindrical wall an outlet for the air and pulverized material, mechanism for rotating said casing, and means for simultaneously producing a current of air inwar and the mass of material at the lowersideof the cylinder, for carrying off the pulverized material.

otating said casd through 6. A pulverizing apparatus, comprising a rotatable casing having air inlet openings in its periphery, mechanism for rotating said casing, an air chamber outside of and adjacent to the periphery of .the rotatable casing,

a feeding inlet for introducing material into said casing an outlet for the air and pulverized material, and means for producing a current of air inward from said chamber through said openings and outward through said outlet to carry off the pulverized material. a

7. A pulverizing apparatus, comprising a rotatable casing mounted on a substantially horizontal axis and having air inlet openings in its, periphery an outlet for the air and pulverized material, mechanism for rotating said casing, whereby the material occupies a segmental portion at the lower diagonal side of the shell, an air chamber located outside! of and adjacent to the ,peripher at said lower diagonal side of the rotata lecasing and communicatingwith said air inlet openings, and means for producing a current 0 air from said chamber through said openings to carry off the pulverized material.

8. A pulverizing apparatus comprising a rotatable-casing having air inlet openings in its periphery, a quantity of loose grinding devlces therein, means for rotating said casing,means for creating a current of air 1nward through said openings, and means for restricting the admission of air to substantially that portion of the periphery of the rcasing occupied by the tumbling mass.

9. pulverizing apparatus, comprising a rotatable casing having air inlet openings in its periphery, a quantity of loose tumbling'devices contained therein for grinding the material, a stationary air chamber outside of and adjacent to the periphery of the rotatable casing, and means for creating a current' of air from said chamber inward throu h said openings and the mass of tumbling 'evices and material within the casing.

10. In a pulverizing apparatus, the combination of a rotatable shell having perforations in its periphery, a quantity of loose tumbling devices in said shell for grinding the material, an air chamber inward 11 around said shell, and means for creating a current of air from said chamber through the perforations and the mass of tumbling devices and material in said shell.

11. In a pulverizing apparatus, the combination of a rotatableshell having perforations inits peripheral wall and mounted on a hollow trunnions, a quantity of loose tumbling devices in said shell, means for feeding material in through one hollow trunnion,

and means for creating a current of air said perforations, the mass of material within the casing and out at the other hollow trunnion.

12. a In a pulverizing apparatus, the combia nation of a rotatable shell having perforations in its peripheral wall, a stationary casing containing an air chamber surrounding said shell, and means for creating a current of air from said chamber through the perforations and the interior of the shell for carrying ofi the pulverized material.

13. n a pulverizing apparatus, the combination of arotatable shell having perforationsin its peripheral .wall, a stationary casing containing an air chamber surrounding said shell, deflecting partitions in said air chamber for directing air through the perforations at one portion of the shell, and means for creating a current of air from said chamber through said perforations and the interior of the shell for carrying oil the pulverized material.

14. In a pulverizing apparatus, the COIM- bination of a rotatable shell having perforations in its peripheral wall, a casing containing an air chamber at the outside of the shell, a lining for said shell containing cavities communicating with said perforations and having openings leading into the interior of the shell, and means for creating a current of .air from said chamber through said linof theshell.

pulverizing apparatus, the com a rotatable shell having perforaperipheral wall, a casing containing and the interior 15..In a bination of tions in its ing an air c liners for the shell containing passages communicating With the perforations in the shell, and a fan for creating a current of anfrom said chamber through the liners and the interior of the shell.

In a pulverizing apparatus, the combination of a rotatable shellhaving perforations, hollow liners having openings communicating with said perforations and formed of interlocking sections arranged in a circular arch within the shell, and means for creating a current of air through the lining and the interior of the;shell.

17. In a pulverizing apparatus, the combination of a rotatable shell having end heads, hollow liners having openings communicating with said perforations and formed of interlocking sections arranged in a circular arch, end liners engaging therewith, and means for creating a current of air through the hollow liners and the interior of the shell. 7

18. In a ulveriz' apparatus, the combination o a. rotate. le shell having peripheral perforations, a stationary casin having an air chamber. surrounding the shel overlapping annular flanges attached to the shell and to the casing, respectively,'for closing the end of said chamber, and means for creating a current of through the interior of the shell.

amber at the outside of the shell, f

air from the chamber 19. In a pulverizing apparatus, the combination of a rotatable casing having air inlet openings in its eripher said openings discharging in a su stantial y tangential direction into the interior of the casing said casing having an outlet for the air and pulverized material, mechanism for rotating the casing, and means for reducing a current of air inward through said tangential openings and outward through said outlet for carrying ofi the pulverized material.

20. In a pulverizing apparatus, the combination of a rotatable casing having its interior peripheral surface provided with longitudinal ribs and substantially tangential air inlet openings adjoining same, said casing having an outlet for the air and pulverized material, mechanism for rotating the casing, and means for producing a current of air inward through said tangential opening and outward through said outlet for carryin off the pulverized material.

21. n a pulverizing apparatus, the combination of a rotatable shell having perforations in its peripheral wall, a lining for said shell having air spaces communicating with said perforations, and substantially tangential air inlet ports from said spaces through the lining into the interior of the mill.

22. In a pulverizing apparatus, the combination with a rotatable shell having perorations in its periphery, of a lining formed in removable sections having air spaces communicating with said perforations, and air inlet ports leading from said spaces through the inner face of the sections.

23. In a pulverizing apparatus, the combination with a rotatable shell having perforations in its periphery, of a lining formed in removable longitudinal sections, each having an air space counicating with said perforations, and air inlet ports leading from said spaces through the inner face of the section.

24. In a pulverizing apparatus, the combination with a rotatable shell having perforations in its periphery, of a lining formed in removable longitudinal sections, each having an air space communicating with said perforations, and air inlet ports leading from said space through the inner face of the section, and end late liners interlocking with said longitudinal -liners.

25. A for rotary pulveriaing mills, comprisinga series of metal sections adapted to fit to et er, said sections having air spaces and a p nralit leading there the sections.

In testimony whereof I have hereunto set my hand.

' aria n. n. ronnaor.

of air inlet ports or passages om through the inner faceof 

